13231223220 has 96 divisors (see below), whose sum is σ = 37538758656. Its totient is φ = 3481833600.

The previous prime is 13231223197. The next prime is 13231223293. The reversal of 13231223220 is 2232213231.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1450875 + ... + 1459965.

It is an arithmetic number, because the mean of its divisors is an integer number (391028736).

Almost surely, 2^13231223220 is an apocalyptic number.

13231223220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13231223220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18769379328).

13231223220 is an abundant number, since it is smaller than the sum of its proper divisors (24307535436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13231223220 is a wasteful number, since it uses less digits than its factorization.

13231223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9421 (or 9419 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 13231223220 its reverse (2232213231), we get a palindrome (15463436451).

The spelling of 13231223220 in words is "thirteen billion, two hundred thirty-one million, two hundred twenty-three thousand, two hundred twenty".